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2 changes: 1 addition & 1 deletion exercises/concept/cater-waiter/.docs/introduction.md
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# Sets


A [set][type-set] is a _mutable_ and _unordered_ collection of [_hasable_][hashable] objects.
A [set][type-set] is a _mutable_ and _unordered_ collection of [_hashable_][hashable] objects.
Set members must be distinct — duplicate items are not allowed.
They can hold multiple different data types and even nested structures like a `tuple` of `tuples` — as long as all elements can be _hashed_.
Sets also come in an immutable [`frozensets`][type-frozenset] flavor.
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